TELCO

Luc MORTH, Mar 20, 2017

Hilfestellungen zum Modul TELCO

Table of Contents

  1. Digitale Modulation
    1. QPSK
    2. QPSK, zeitlicher Verlauf
    3. QPSK-pi/4
    4. FSK
  2. PCM
    1. Sampling and Aliasing
  3. Fourier
    1. Fourier series of a square wave signal and transition to its Fourier transform
    2. Addition von 2 Sinuskurven

1.

Digitale Modulation

  • 1. QPSK
  • 2. QPSK, zeitlicher Verlauf
  • 3. QPSK-pi/4
  • 4. FSK

1.1.

QPSK

– Luc MORTH

1.2.

–

1.3.

–

1.4.

–

2.

PCM

  • 1. Sampling and Aliasing

2.1.

Sampling and Aliasing

This workbook shows the result in the frequency domain of sampling a voice signal either with or without an anti-alising filter. The reconstructed signal contains not only the original signal, but also aliases of the original signal both above and below multiples of the sampling frequency. We can use a low pass reconstruction filter to eliminate the aliases as long as we sample fast enough that the nearest alias does not fold into or below the frequency of the original signal. If we band limit the original signal with an anti-aliasing filter, we reduce the bandwith and storage requirements of our system.
– Luc MORTH

3.

Fourier

  • 1. Fourier series of a square wave signal and transition to its Fourier transform
  • 2. Addition von 2 Sinuskurven

3.1.

Fourier series of a square wave signal and transition to its Fourier transform

This applets shows how the fourier series goes over to a fourier transform when changing from a periodic signal to an aperiodic signal.
– Claude Loullingen

3.2.

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